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coordinates of vertex

Hello
I use TopExp_Explorer to find vertices in a shape. These vertices are stored in a TopTools_SequenceOfShape. Now i want to find coordinates of these vertices. But in TopoDS, I don't find methods to do that. I only find this method in gp_Pnt. Is it possible to transform a TopoDS_Vertex in gp_Pnt
Thanks for your help.
Jerome